<!-- eslint-disable vue/no-unused-components -->
<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader @addTodo="addTodo"/>
        <MyList :todos="todos"/>
        <MyFooter
            :todos="todos"
            @checkAllTodo="checkAllTodo"
            @clearAllDoneTodo="clearAllDoneTodo"
        />
      </div>
    </div>
  </div>
</template>

<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader.vue'
import MyList from './components/MyList.vue'
import MyFooter from './components/MyFooter.vue'

export default {
  name: 'App',
  components: {
    MyHeader,
    MyList,
    MyFooter
  },
  data(){
    return {
        // todos: [
        //   // {id: '001', title: '敲代码', done: true},
        //   // {id: '002', title: '吃饭', done: false},
        //   // {id: '003', title: '睡觉', done: false},
        //   // {id: '004', title: '跑步', done: true},
        // ]
        todos: JSON.parse(localStorage.getItem('todos')) || []
      }
  },


  methods:{
    //添加一个todo
    addTodo(todoObj){
      this.todos.unshift(todoObj)
    },
    //勾选或者取消勾选一个todo
    checkTodo(id){
      this.todos.forEach((todo)=>{
        if(todo.id === id) todo.done = !todo.done
      })
    },

    //更新一个todo
    updateTodo(id, title){
      this.todos.forEach((todo)=>{
        if(todo.id === id) todo.title = title
      })
    },


    //删除一个todo
    deleteTodo(_, id){
      this.todos = this.todos.filter(todo => todo.id !== id)
    },
    //全选or取消全选
    checkAllTodo(done){
      this.todos.forEach((todo)=>{
        todo.done = done
      })
      
    },
    //清除所有已完成任务
    clearAllDoneTodo(){
      this.todos = this.todos.filter(todo=> !todo.done)
    }
  },

  watch: {
    //开启深度监视
    todos: {
      handler(value){
        localStorage.setItem('todos', JSON.stringify(value))
      },
      deep: true
    }
  },

  //一挂载就绑定事件
  mounted(){
    this.$bus.$on('checkTodo', this.checkTodo)
    // this.$bus.$on('deleteTodo', this.deleteTodo)
    this.$bus.$on('updateTodo', this.updateTodo)
    this.pubId = pubsub.subscribe('deleteTodo', this.deleteTodo) // 消息订阅与发布
  },

  beforeDestroy(){
    //组件销毁前，解绑事件
    this.$bus.$off('checkTodo')
    // this.$bus.$off('deleteTodo')
    this.$bus.$off('updateTodo')
    pubsub.unsubscribe(this.pubId)
    
  }
}
</script>

<style>
  /*base*/
  body {
    background: #fff;
  }

  .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
  }

  .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
  }

  .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
  }

  .btn-edit {
    color: #fff;
    background-color: skyblue;
    border: 1px solid rgb(103, 159, 180);
    margin-right: 5px;
  }

  .btn-edit:hover {
    color: #fff;
    background-color: rgb(103, 159, 180);
  }

  .btn:focus {
    outline: none;
  }

  .todo-container {
    width: 600px;
    margin: 0 auto;
  }
  .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
  }

</style>
